String extensions toDate() is crash some device

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Two solutions:

  1. Add en_US_POSIX locale for a fixed format.

  2. Use ISO8601DateFormatter (iOS 8+), the benefit is no locale, no date format, no time zone.

    func toDate() -> Date? {
    let dateFormatter = ISO8601DateFormatter()
    return dateFormatter.date(from: self) 
}

In any case return an optional, fatalError() in production environment causes pretty bad user experience.

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